#include <47func.h>
int main(int argc, char *argv[])
{
    // ./4_server 192.168.118.128 1234
    ARGS_CHECK(argc,3);
    int sockfd = socket(AF_INET,SOCK_STREAM,0);
    // AF_INET ipv4 SOCK_STREAM TCP
    struct sockaddr_in serverAddr;//带in 是ipv4地址 带in6是ipv6地址 不带是通用地址
    serverAddr.sin_family = AF_INET;//ipv4
    serverAddr.sin_addr.s_addr = inet_addr(argv[1]);//把点分十进制的ip地址转换成32位大端存储的地址
    serverAddr.sin_port = htons(atoi(argv[2]));//把端口用大端存储
    int reuse = 1;// setsockopt函数中SO_REUSEADDR的选项
    int ret = setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse));
    ERROR_CHECK(ret,-1,"setsockopt");
    ret = bind(sockfd,(struct sockaddr *)&serverAddr,sizeof(serverAddr));
    ERROR_CHECK(ret,-1,"bind");
    ret = listen(sockfd,10);
    ERROR_CHECK(ret,-1,"listen");
    struct sockaddr_in clientAddr;
    socklen_t clientAddrSize = sizeof(clientAddr);//一定要赋予初值
    fd_set monitorset;//监听集合
    FD_ZERO(&monitorset);
    FD_SET(sockfd,&monitorset);//监听集合里面只有sockfd
    fd_set readyset;//就绪集合
    int netfd = -1;
    char buf[4096] = {0};
    while(1){
        memcpy(&readyset,&monitorset,sizeof(fd_set));
        select(10,&readyset,NULL,NULL,NULL);
        if(FD_ISSET(sockfd,&readyset)){
            // 有客户端 connect
            netfd = accept(sockfd,(struct sockaddr *)&clientAddr,&clientAddrSize);
            // sockfd专门用来建立连接 netfd负责和客户端的数据通信
            printf("addrlen = %d\n",clientAddrSize);
            printf("client sin_family = %d\n",clientAddr.sin_family);
            printf("client ip = %s\n", inet_ntoa(clientAddr.sin_addr));
            printf("client port =%d\n", ntohs(clientAddr.sin_port));
            // 修改监听的文件描述符
            FD_SET(netfd,&monitorset);
            FD_SET(STDIN_FILENO,&monitorset);
            FD_CLR(sockfd,&monitorset);
        }
        if(netfd != -1 && FD_ISSET(netfd,&readyset)){
            bzero(buf,sizeof(buf));
            ssize_t sret = recv(netfd,buf,sizeof(buf),0);
            if(sret == 0){
                //对方断开连接
                FD_CLR(netfd,&monitorset);
                close(netfd);
                netfd = -1;
                FD_CLR(STDIN_FILENO,&monitorset);
                FD_SET(sockfd,&monitorset);
                continue;
            }
            printf("buf = %s\n",buf);
        }
        if(FD_ISSET(STDIN_FILENO,&readyset)){
            bzero(buf,sizeof(buf));
            ssize_t sret = read(STDIN_FILENO,buf,sizeof(buf));
            if(sret == 0){
                send(netfd,"nishigehaoren",13,0);
                FD_CLR(netfd,&monitorset);
                close(netfd);
                netfd = -1;
                FD_CLR(STDIN_FILENO,&monitorset);
                FD_SET(sockfd,&monitorset);
                continue;
            }
            send(netfd,buf,strlen(buf),0);
        }
    }
    return 0;
}

